Athena is an aromatherapy class instructor, and her heart is full of rich emotions. She lives a very lonely life every day, and every day is the same pattern. Every day she buys a balloon and writes her mood and releases it. One day when she was taking a shower, she heard a loud noise on the roof and saw a huge winged monster, which turned out to be an injured angel (Takeshi Kaneshiro). The angel needs love to sustain life every day, so Athena takes him through the city every day. The angel also knows that Athena has been depressed because she has been worried about her dead ex-boyfriend, and the angel also decided to help her find happiness and vitality. The angel learned that during the midnight mass when the millennium comes, the Holy Door of the Vatican will be opened, and the angel can return to his own place. He asked Athena to take him to the Vatican...